chore: remove trailing slash from API base URL (#464)

The `packngo` SDK assumed that the base API URL did not end with a
slash, but `equinix-sdk-go` assumes that it does (since it's generated
from an OpenAPI spec, all API paths in `equinix-sdk-go` start with a
slash). A trailing slash on the base API URL doesn't cause problems for
`equinix-sdk-go`, but it can cause confusion when triaging issues.

This removes the trailing slash from the 2 places where we are
configuring the base API URL. We can do this safely now because we no
longer use `packngo`. Alternatively, we could make the base API URL
configuration optional; the API URL configured here is identical to [the
default used by the `metalv1` package in
`equinix-sdk-go`](https://github.com/equinix/equinix-sdk-go/blob/main/services/metalv1/configuration.go#L97),
so we only really need to change the API URL for tests that use a mock
API. That change would be more extensive so I opted for the smallest
change instead.

cmd/cli.go

@@ -46,7 +46,7 @@ var (
 const (
 	consumerToken  = "Equinix Metal CLI"
 	apiTokenEnvVar = "METAL_AUTH_TOKEN"
-	apiURL         = "https://api.equinix.com/metal/v1/"
+	apiURL         = "https://api.equinix.com/metal/v1"
 )
 
 // NewCli struct

test/helper/helper.go

@@ -19,7 +19,7 @@ import (
 
 const (
 	ConsumerToken = ""
-	URL           = "https://api.equinix.com/metal/v1/"
+	URL           = "https://api.equinix.com/metal/v1"
 	Version       = "metal"
 )